Our brand new 4-2-1 Race Header is finally here. After months of testing every aspect of this design, we finally have an affordable, high-performance race header for your K series Miata swap.
Customers choosing this header over our Street Header can expect noticeable mid-range gains, as well as the ability to support 300+whp builds.
This header features:
- A 4-2-1 runner design
- 304 brushed stainless construction
- Three welded true merge collectors
- Proper cylinder pairing (4 and 1 paired, 2 and 3 paired)
- 1.88 inch primary runners
- 2.13 inch secondary runners
- 2.5 inch collector
- 2.5 to 3.00 inch transition
- Full V-band assembly
- O2 sensor bung
- All necessary gaskets
Due to this type of design, clearances below the engine are extremely tight. Because of this, headers ship with a custom slim-fit flywheel dust shield. Additionally, this header sits slightly lower than other headers we have produced. The minor reduction of ground clearance is behind the front wheels and oil pan, and has not posed an issue on our test car with a 4” pinch weld ride height.
*This header is specifically designed for K24 fitment. If you’re using a K20 block, minor modification may be needed.
**Your exhaust must include a flex pipe right after the header. We do not warranty cracked headers from improper use; therefore a flex should be installed in order to expect lifetime use from the header.